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FULLERTON, Orange County, Calif., Sept. 27, 2026 — Three vehicles collided on Saturday evening, September 26, in the carpool lane of southbound State Route 57 near Yorba Linda Boulevard in Fullerton, according to the California Highway Patrol. At least one person reported possible injury, and two vehicles were left disabled in the roadway.
The California Highway Patrol said a caller reported being involved in the crash, which involved a white Honda sedan, a white Tesla sedan, and a gray SUV blocking the HOV lane.
Fire crews and CHP units responded to the scene and confirmed two vehicles were not drivable and were blocking the carpool lane. Tow trucks were requested to clear the wreckage, and the roadway was reported clear within about an hour of the initial call, with towing operations continuing at a nearby gas station on Yorba Linda Boulevard.
The extent of injuries has not been detailed, and the CHP has not released information on what led to the collision. The crash remains under investigation.
We wish those injured a full recovery.
Why Do Multi-Vehicle Crashes Turn Into Chain-Reaction Pileups in HOV Lanes?
A crash in a carpool lane starts the same way most multi-vehicle wrecks do: one vehicle slows or stops unexpectedly, and the driver behind does not have room to react. Because HOV lanes are typically bordered by a solid double line or a barrier rather than an open shoulder, there is nowhere for trailing vehicles to swerve. That narrow margin turns a single fender-bender into a blocked lane almost instantly.
What happens next is what separates a two-car crash from a three-car pileup. Traffic behind the initial collision keeps arriving at highway speed before drivers have time to register that lanes ahead are blocked. A second vehicle strikes the first pair, or clips a car trying to merge out of the lane, and the wreckage spreads across more of the roadway. Each additional impact adds new debris, new stopped vehicles, and new risk for the next car approaching.
According to the Insurance Institute for Highway Safety, 17,008 motor-vehicle crash deaths occurred outside passenger vehicles in crashes involving passenger vehicles in 2023. That figure includes pedestrians, cyclists and others caught outside a vehicle when a crash unfolds, a reminder that people who stop to check on damage or exchange information are exposed to the same following traffic that caused the original collision.
Frequently Asked Questions
How can drivers avoid getting pulled into a pileup?
Keep a steady following distance and scan several vehicles ahead, not just the car directly in front. Early warning of brake lights gives more time to slow gradually instead of braking hard at the last second.
What should I do if I come up on a crash blocking the highway?
Slow down well before reaching the scene, turn on hazard lights to warn traffic behind, and move into an open lane if it is safe to do so. Stay inside your vehicle unless it is unsafe to remain there, since standing near live traffic carries its own risk.
Does fog or low visibility make pileups more likely?
Yes. Reduced visibility shortens the distance drivers have to spot a stopped vehicle, which is why chain-reaction crashes cluster during fog, heavy rain, or glare from low sun.
Why does following distance matter so much on freeways?
At highway speeds, a car needs several seconds to stop safely. Tailgating removes that buffer, so even a small slowdown ahead can force a driver into a collision they had no time to avoid.
What to Do After a Multi-Vehicle Crash in Fullerton, CA
If you're involved in or near a multi-car collision in Fullerton, move to safety first if your vehicle is drivable and it's safe to do so. Call 911 to report injuries and confirm emergency crews are on the way. Even if you feel fine, some injuries from a chain-reaction collision don't show symptoms right away, so a medical check is worth doing soon after. Exchange information with other drivers when possible, take photos of vehicle positions and damage, and file a report with the California Highway Patrol if one hasn't already been started at the scene.
